Hand screw



s; S'YLVESTER. HAND SCREW.

APPLICATION FILED SERT. I. 1921.

1,429,050, Patented Sept. 12, 1922.-

']] Will/l7 Q a w NW AITOR 157577210102 yZz'as $1 I 25 t W 4Z4?ATTORNEY.

. This invention jects, first, to simplify the construction and v tionalview taken angular movement of the latter.

Patented Sept. 12, 1922.

SEYMOUR SYLVESTER, 0F BROOKLYN, NEW YORK.

HAND SCREW.

Application filed September 1, 1921., .Serial No. 497, 75e

inthe construction. of hand screws in which adjustable clamping aws may.be moved freely and axially of a pair of threaded spindles to engagethe opposite surfaces of an object and then to receive furtheradjustment about the threads of said spindles to move the jawsintocloser proximity with each other. i

has for its primary co operation of such devices; second, to afiord freeor screw adjustment for a pair of clamping jaws; third, to provide'meanscarried by the clamplng aws whereby relative adjustment of one .jaw maybe made independently of the other jaw and fourth, to

so construct the clamping jaws that each may be adjusted at an angle toeach other orin respect to the axis of the threaded spindles extendingbetween the two jaws.

The invention is specification and illustratively exemplified in theaccompanying drawing, wherein.

Fig. 1 is a Fig. 2 is a substantially longitudinal secthrough one of thehandles and its adjacent parts.

i Fig.

rangement of the clamping jaws aflord Fig. 1 is a detail or spindle usedI fieferring to the drawing, 10 and.11 denote the two clamping jaws,'hereinafter referredto as the upper and lower. clamping jawsrespectively, said jaws being prefera-- bly constructed of squarestockfcut ,tosuitable length and beveled atits forward end from a pointslightly above the lower or inner edge tothe outer 1 v I p I I i capableof free rotary movement 1 face-of the V fully described. in theperspective view of my improved hand screw showing the. clamping.jaws'slightly parted.

V register with the 3 is a viewsimilar to that shown Fig. 2, except thatthe construction and ari w f'ih j hinge end portion of the threadedscrew in the construction shown in threads respectively, an

hard wood or metal and. having their opposedinner' faces substantiallystraight. Each jawis made from of they openings 16 which. prevent axialIn Fig; 1 the upper. jaw 10 isfprovided with a countersunk portion 12extending. transversely of the length of the; jaw and located slightlyin the rear of the bevelcat the-nose of the jaw. This countersunkpon' Itionis shallow andleads to a s econ'd laterally d sposed depressiorr13shown in Fig.2,

and whi h is circular in shape and substantially smaller in diameterthanthe other dejpression or countersunkpo rti'on 12 From the inner wall ofthe second depression and extending axially thereof through the bodyofthejaw 10 to the opposite face is a round bore 13. 'Mounted in thecountersunk portion 12 and held" inposition' by rivets $14; 7

self-to a plate 15 having an opening therein which extend through thebody of thejaw .it-

adapted to register with the bore 13. simila'r construction, asdescribed above, ispro videdin the outer face of the lowerclamp ingj aw11, except that theplate'15 is mount- I ediin acountersunk portion 12located'at the" rearwardend of the'jaw, said plate being held in;positionby fourv rivets instead of two, as shown in the jaw 10. Thismechanical expedient has been resorted tobecause this-portlon-of the jaw ll 1is calledluponto withstand the entire pulling: strain caused bythe clamping action of the'device.

' Tn carrying my-invention into practice- I provide the jaws 10 and it Wh ea ed spindlesor screws 16 and 17 respectively, extending at,substantially right angles to the inner faces of the jaws 'and adaptedto bores 13 whenthe twolj aws areplaced one above the other, ,It will benoted, with referenceto' Fig.2, that these spindles 16 and 1 7; are freeto be moved axially of the bores 13, "so at to permitrela tiveadjustmentof'the two jaws toward and away. from :each other;

The threads of the spindles 17 and.1j 6are right and left hand:

, fd' receive operating handles '19- at; their outer free, ends whichproject "beyond the openings 16 in the plates 15 and which are providedwith. oppositely disposed I pivoted detentsff2'0 adapted to] engage thethreads of the spindles. The ,in-

nerqends ;'of the handles. 19; are provided with annular grooves in'which the walls a'rfeadaptedto seat'and displacement 'Ofjth a handles.Theiout er' flange 22 of-the groove 21 is confined'tothe'secondpdepression .18

its

below the countersunk portion 12 and, is f when the handle is turnedabout the spindle.

The handles 19 for both spindles 16 and 17 are substantially alike and adetail description of one these members will. suflice.

The body portion of the handle, as shown in Fig. 2, comprises acylindrical metal tube 23 having an annular flange 2 1 extendingoutwardly about midway of its length and which terminates at one end inthe groove 21 and flange 22 and at the opposite end in a reduced portion25 adapted to receive a wooden grip 26. The detents 20 are pivotallymounted in longitudinal grooves or slots 27 located at diametricallyopposite sides of the tube 23, said detents being provided with ofl'setouter ends 28 which are normally held away from the base of the slots 27by means of coiled springs 29 yieldably engaging the under sides of theoffset portions 28 at one of their ends and the other of which ends restin seats provided in the bottom of the slots 27. In this position theoffset portion 28 of the detents 20 will project above the periphery ofthe tube 23 and the opposite ends having the teeth 30 will be engagedagainst the threads of the spindles 16 and 17. It will be noted that thedetents 20 adapted to engage the threads of spindle 17 are reversed sothat the offset portion 28 thereof will be uppermost and the engagingteeth 80 will be below the pivot; thisconstruction has been madenecessary due to the right hand threads of this spindle. The two handles19 although similar in construction produce a very different operatingeffect, as hereinafter described.

Referring now to Figs. 3 and 4 which show a slightly modified form ofmounting the spindles so as to permit angular move ment of one jawrelative to the other as well as axial movement I provide the attachedend of each spindle 16 and 17 with a cross head 31 adapted to pivotallybear in a laterally disposed opening 32 extending transversely of thebody of the aws 10 and 11. In order to permit the spindles 1.6 and 17 torock about the cross heads 31 as pivots the lower portions of theopenings 32 are V shaped as indicated at 33. Instead of the bore 13 ofthe preceding construction, shown in Fig. 2, the walls, surrounding thespindles 16 and 17, at their opposite ends converge toward the center toa point substantially in the center of the body of the jaw and are thenflared outwardly again to the under surface of the jaw. It will be notedthat with the jaws constructed as in Fig. 3, and

the spindles pivotally mounted as described in the foregoing paragraph,the clamping members may be adjusted to any angle. This is particularlydesirable where irregular surfaces are to be engaged and clamped, therebeing no need to first square such surfaces in order to provide grippingsurface for the jaws. By proper manipulation one jaw may be made tooverlap the other while they are both held in substantially parallelrelation. Such an adjustment is very desirable where one of the aws iscompelled to engage a narrow surface while the other jaw may be free toutilize a much larger surface against which to engage.

The operation of the hand screw is as follows The work about to beclamped having been made readyto receive the hand screw, the handles ofthe latter are held one in each hand with the thumbs overlying theoffset portions of the detents 20 and with the beveled ends of the jaws10 and 11 projecting outwardly away from the operator. The handles maythen be moved axially of the spindles 16 and 17 until the inner faces ofthe jaws have been separated far enough L to be placed over the oppositesurfaces of the work. In doing this it is first necessary to depress theolfset portion of the detent 2O to release the handle 19 which operateson the spindle 17 having the right hand threads. The jaws 10 and 11 arethen moved toward each other and against the edges of the'work, thismovement being effected by releasing the detent 20 which engages thethreads of the spindle 16 and pushing inwardly on the handle 19 mountedonthe spindle 17. The inner faces of the jaws 10 and 11 should then bein contact with the opposite surfaces of the work and in order totighten the further against the work all that is necessary is to turnthe handles in opposite directions indicated by the arrows a and b inFig. 1. This last operation will cause the handles 19 and jaws 10 and 11to move axially of the spindles 17 and 16 respectively, and toward eachother. As above stated, the action of the handles 19 and their detent-s20 in conjunction with the two screws 16 and 17 is substantiallydifferent, because when the handle 19 is turned about the spindle 17 totighten the jaw 10 there will be a pulling action of the spindle to drawthe jaw 11 towards the jaw 10, while, when the other handle is turnedabout the spindle 16 there will be a tendency to push the jaw 11 in--wardly towards the other jaw 10. Hence, the four rivets to hold theplate 15 in its proper position in the rear portion of the jaw 11 sothat the strain exerted on the plate 15 ivill be equalized in the bodyof the jaw itse f.

To release the tightened jaws 10 and 11 the offset portions of thedetents 20 are depressed and the latter disengaged from the threads ofthe spindles 16 and 17, whereupon the handles 19 are free to moveaxially of the spindles to separate the jaws one from the other.

I claim j 1. In a tool of the character described,

the combination. of adjustably mounted clamping jaws, a spindle fixed toeach jaw and adapted to move freely in an opening in the other jaw, andjaws and capable of free axial and rotary movement and screw adjustmentabout said spindles, whereby the clamping jaws may first be movedunobstructedly toward each other and then receive further adjustmentabout said spindles, to be ,forced into closer proximity with eachother.

2. In a hand screw, the combination with movable clamping jaws, ofrelatively moveable spindles fixed to said jaws, and adjustable gripsmounted in said jaws and capable of relative rotary movement therein andboth rotary and axial movement about said spindles, each of said gripscomprising a tubular member provided with spring actuated detentsadapted to normally engage the threads of its spindle, said detentsbeing rocked to release the grips to move said jaws unobstructedlytoward or away from each other and then permitting said detentsto returnto their normal positions to further adjust said grips and jaws aboutthe threads of said spindles. i

3. In a hand screw, the combination with upper and lower relativelymovable clamping jaws, of a threaded spindle fixed to each jaw andadjustable in an opening in the opposite jaw,

means carried by said moved freely a predetermined distance toward eachother and then forced to move movement of said handles.

' handles capable of rotary I movement in relation to said jaws -anolyieldably engage thethreads 40 further in the same direction by. rotary4:. In a hand screw clamp, the combination with relatively movable jaws,screw spindles n movement through,

fixed to opposite jaws, the free ends of said spindles having axialopenings in the opposite jaws,'=handle members rotatably mounted in eachof said j aws of said spindles and adapted to move axially with thejaws, and means pivotally mounted in said handles and yieldably held inthe path of possible movement of the'threads of said spindles, wherebysaid means may be i,

operated to permit free axial movementof the spindles through theopenings in said jaws to move the latter relatively of .each

other and then released to engage with the threadsof the spindles tofurther adjust-the j aws by rotary movement of the handles.

In testimony whereof I have afiixed' my s1 gnature.

- SEYMOUR srLv sTER.

